package com.tom;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

/**
 * Servlet Filter implementation class ImgFilter
 */
public class ImgFilter implements Filter {

    /**
     * Default constructor. 
     */
    public ImgFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;
		String referer = req.getHeader("referer");
		if (referer==null || !referer.contains(req.getServerName())){
			req.getRequestDispatcher("images/error.jpg").forward(request, response);
		}else{
		// TODO Auto-generated method stub
		// place your code here

		// pass the request along the filter chain
		chain.doFilter(request, response);
	}
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
